tree derivation

• 树形图

tree derivation的用法和样例：

例句

1. For instance, I know chimpanzees have demonstrated abstract thought.But baboons are on a whole different limb of the evolutionary tree.
   举例来说吧，我知道黑猩猩能够进行抽象思维，但是狒狒在生物进化树形图中处于不同的支系。